docs: def add_maps(self, parent, root_path=""):
          """
          Recursively add maps in a folder hierarchy.
  
          Args:
              parent (KMLElement): KMLElement to which we want to append child folders or maps respectively
              root_path (str): path of 'parent'
          """
          for mapsource in self.map_folders[root_path]['maps']:
              parent.append(self.get_network_link(mapsource))
          for folder in self.map_folders[root_path]['folders']:
              kml_folder_obj = kml_folder(folder)
              parent.append(kml_folder_obj)
              self.add_maps(parent=kml_folder_obj, root_path=F_SEP.join((root_path, folder)))